Improvement in head-rests for dental chairs



U NI'IED STATES PATENT OFFICE...

ELI T STARK, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 SAMUEL S.

WHITE, OF SAME PLAGE.

lMP-ROVEMENT IN HEAD-RESTS FOR DENTAL CHAIRS.

Speeificat1on i'orming art 0f Letters Patent N0. l71539, dated December28, 1875; application filed November 5, 1875.

OASE B.

T0 all whom it mag; concern:

Be it known that I, ELI T. STARK, of Philadelphia, Pennsylvania, haveinvented'certain new and useful Improvements in Head-Rests for Dentistsand other Ohairs, of which the following is a specification:

My invention relates to head-re'sts 0f that dass capable 0f adjustmentvertically, laterally, and longitudinally relatively to the 0hair. Itsobjeet is t0 give even a wider range of adjustment t0 the head-rest thanhas heretofore been praeticable, whieh end I attain by se0uring; thesupporting-bar 011 0ne side of the can- -tral lii1e 0f the head-restandmounting it in a turning-pst, in which it freely slides and turns whenreleased fr0m its clamp-screw, whereby the position 0f the head-rest maybe reversed.

The subject-matter claimed is hereinafter specified.

In the accompan5ing drawings, Figure 1 represents a view, inperspective, 0f myin1- proved apparatus w1th the head-rest elevated; andFig. 2, a vertical longitudinal central section therethrough, on anenlarged scale, showin g the head-rest as depressed. The head-rest A, 0fapproved construction, has seeured 130 it 011 one side of its centrallongitudinal lin0, by means 0f suitable braukets b b, a rod, B, capable0f 1noving freely endwise and ot' turning in its socket 0r bearing in asectional adjusting frame 0r holder, O C, in turn capable of turning andsliding-upon tl1e usual supporting-bar E, vertically adjustable upon theback 0f the ehair by well-known n1eans. This adjusting-frame is hold bythe usual dampscrew D.

I will now proeeed t0 deseribe the distinguishing characteristio 0f myinvention. The l0wer portion, O, 0f the holder is provided With ahearing-shoe, c, acted up0n by the clamp-serew, and,in turn, bearinguponthe supporting-bar E. Another shoe, c, rests up- 011 the upper side0f the support E and extends into the upper section 0 far enough to bearagainst another shoe, c, up0n which the supporting-rod B rests. 'Iheupper section, O, 0f tlie ad jnsting-frame which I eall a turning-post,is secured 130 the lower one by means 0f an annular fiange, F, screwingupon the lower section anti overlapping a shoulder 0n the t urning-post,said ring being held in piace by a check-screw, f.

By this mode 0f construetion the turningp0st is capable 0f turningfreely in the lower portion, O, 0fthe adj usting-frame, which gives thecapacity of varying the angle 0f the h'eadrest horizontallyrelatively toth0 chair, even 130 the extent 0f reversing it entireiyand by thenswinging the head-rest 0ver by roeking it in its bearings it may beadjusted vertically t0 any desired position. It may also be movedlaterally by sliding it endwise in the turningpost, and the latter maybe adjusted back ward 0r forward, 0r at any desired angle, by sliding 0rturning the adjusting-frame 0n its snpportin g-bar, and all the partsmay be firmly clamped in nny desired position by tightening the singleclan1p-screm The operation 0f my invention and its advantages willreadily be understood fr0u1 the foregoing description.

I claim as my invention l. A head-rest mounted. upon a supportingbar,secured upon 0ne side 0f its longitudinal eenter and rocking in aturning-post, whereby the head-rest is rendered reversible and a widerange 0f motion imparted 130 it, substantialiy as set f0rth.

2. The sectional adjusting-frame hereinbefore described, consisting 0f alow er seotion, a turning-post mounted thereon, and a clampscrew, thesemembers being' constructed and operatingin eombination, substantially ashereinbefore sei; forth.

In testimony whereof I have hereunto subseribed my name.

ELI T. S'IAER.

Witnesses:

FRANK L. BIS E, J. B. WILLIAMS.

